java导入子目录

Question

我的目录结构是这样的:

folder
└───subfolder
    └───subsubfolder

我在 folder 中有一个 Main.java，而 Main.java 使用 subsubfolder 中的类。这是我的做法:

import subfolder.*;
import subfolder.subsubfolder.*;

但是，当我执行 javac Main.java

时，我得到了以下消息

$ javac -g Main.java
Main.java:23: error: cannot access Node
      Node root = new Node();
      ^
  bad class file: ./subfolder/subsubfolder/Node.class
    class file contains wrong class: subsubfolder.Node
    Please remove or make sure it appears in the correct subdirectory of the classpath.
1 error

是不是我导入class文件的方式不对？

Answer 1

It says package subfolder

Node的封装声明应该说

package subfolder.subsubfolder;

为清楚起见提供示例:

folder/
        Your source root (typically called 'src')

folder/Main.java
        class Main { ... }  (no package declaration)

folder/subfolder

folder/subfolder/subsubfolder/Node.java
        package subfolder.subsubfolder;
        public class Node { ... }

如果您的 Main确实生活在一个包裹中(即如果你的情况类似于 src/folder/Main.java )那么你应该不做

cd src/folder
javac Main.java

你应该做的

cd src
javac folder/Main.java